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I see the same weird behavior in a couple of servers and also on fresh installed machines. In an older ticket i've opened about this, support said that it's probably a munin bug. They were able to reproduce this behavior.

Staff Member

This warning should be disregarded. It is due to how Munin versus MySQL handle tablespace for InnoDB. By default, Munin throws a warning at 2GB free tablespace and critical alert at 1GB free tablespace. However, MySQL defaults to creating a 10MB autoexpanding tablespace. The tablespace can be verified with:

Code:

mysql -e "SHOW VARIABLES LIKE 'innodb_data_file_path'"

This means InnoDB will perpetually show <10MB of space (resulting in a permanent Munin warning) yet will always seamlessly autoextend as needed. The only "limit" in such a configuration is the partition that /var/lib/mysql is stored on. This render's the InnoDB free tablespace useless in an "autoextend" configuration.